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Related Concept Videos

Tooth Anatomy01:21

Tooth Anatomy

2.0K
The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or...
2.0K

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Related Experiment Video

Updated: Jan 11, 2026

Author Spotlight: 3D Movement Assessment of Maxillary Posterior Teeth in Clear Aligner Treatment
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Bruxism Simulation in Aligner Therapy: Effects on Restored Posterior Teeth.

Amelia Anita Boitor Andreica1, Adriana Objelean1, Cristina Gasparik1

  • 1Department of Prosthetic Dentistry and Dental Materials, Iuliu Hatieganu University of Medicine and Pharmacy (UMFIH), 400006 Cluj-Napoca, Romania.

Journal of Clinical Medicine
|November 13, 2025
PubMed
Summary

Parafunctional habits like bruxism significantly increase wear on dental restorations and clear aligners (CAs) during orthodontic treatment. This study shows simulated bruxism damages composite restorations and compromises aligner integrity, necessitating durable materials for bruxer patients.

Keywords:
alignersbruxismchewing simulationcomposite restorationsdentistrydigital orthodonticsorthodonticstreatment planning

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Area of Science:

  • Dental Materials Science
  • Orthodontics
  • Biomaterials Engineering

Background:

  • Parafunctional habits, such as bruxism, generate substantial occlusal forces.
  • These forces can negatively impact the longevity of dental restorations.
  • Orthodontic treatment with clear aligners (CAs) may be further challenged by these habits.

Purpose of the Study:

  • To evaluate the surface wear of Class II composite restorations under simulated parafunctional loading.
  • To assess the integrity and wear of clear aligners (CAs) during simulated bruxism.
  • To compare the effects of normal masticatory forces versus bruxism-mimicking forces on restorations and aligners.

Main Methods:

  • An ex vivo study involving 34 posterior teeth with Class II composite restorations.
  • Teeth were subjected to either normal masticatory forces or high-intensity cyclic forces simulating bruxism.
  • Restorations and fitted clear aligners were analyzed for surface wear and integrity changes.

Main Results:

  • Parafunctional loading significantly increased surface degradation of composite restorations.
  • Clear aligner (CA) wear and thickness reduction were significantly higher under parafunctional forces compared to normal forces (0.0304 mm vs. 0.0122 mm).
  • Reduced positional accuracy was observed under parafunctional forces, indicated by higher RMS errors (33.5 vs. 21.5 units).

Conclusions:

  • Parafunctional forces significantly exacerbate surface wear in Class II composite restorations during clear aligner therapy.
  • Simulated bruxism compromises the structural integrity of clear aligners, affecting treatment accuracy.
  • Durable restorative and aligner materials are crucial for successful orthodontic treatment in patients with bruxing habits.